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Fig. 5. An increase in electron density is coupled to a decrease in width as WPBs mature. (A) A low magnification view shows both immature (arrow) and mature (arrowhead) WPBs within one section. Bar, 5 µm. (B-D) Mature WPBs found in the periphery of the cells show a dramatic increase in electron density. Bars, 500 nm (B), 200 nm (C) and 500 nm (D). (E) Percentage of WPBs in each width size bin for immature (white, n=51) and mature (black, n=34). G, Golgi; M, mitochondrion; N, nucleus; PM, plasma membrane; TGN, trans-Golgi network; RER, rough endoplasmic reticulum.